(strictly) The killing or punishment of every tenth person, usually by lot. / (generally) The killing or destruction of any large portion of a population. / A tithe or the act of tithing.

plural of decimation

In a decimal scheme or notation.

(mathematics) Having a degree of ten

(rare) plural of decimalization

plural of decime

A devastator or destroyer. / A collector or receiver of tithes.

plural of decimator

(dated) The decimal system.

(transitive, intransitive): To convert to the decimal system.